Basic Questions
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Multiple Choice
1/1 point (graded)
This a multiple-choice problem. You will choose just one response, receiving cred
... [Show More] it for
the right answer.
Select a vowel from the list below.
A correct
B
C
D
E
Submit
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the Submit button.
Hint Show Answer
Dropdown
1/1 point (graded)
This is a dropdown problem. It's basically identical to a multiple-choice problem, it just
displays things in a different way. Dropdown problems only ever have one correct
answer.
Which of these numbers is a prime number?
correct
Submit
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the Submit button.
Hint Show Answer
Checkboxes
1/1 point (graded)
This a checkbox problem, also known as a "check all that apply" problem. You will
choose ALL of the correct responses, receiving full credit only if you select all of them
and none of the incorrect answers.
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This problem also allows for partial credit! It uses a scheme called "Every Decision
Counts," which is the standard scheme in this course. Each choice is worth an equal
amount of the total credit (20% in this case). Try answering the question different ways
to see how partial credit works!
Which of the following are vowels? Select all that apply.
A
B
C
D
E
Complex Questions
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Numerical Input
1/1 point (graded)
Some problems require a numerical input. Your answer will be marked correct if it is
within a certain range of the right answer (usually about 5%, though it varies from
problem to problem).
If you need a calculator, you can find an icon in the bottom right-hand corner of your
window that will show one for you. Click the (i) button to learn how to use it. You can
also find many good calculators online, from Google's push-button calculator to Wolfram
Alpha.
Enter the approximate value of the mathematical constant π (pi):
correct
3.14
Submit
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the Submit button.
Show Answer
Exponential Input
1/1 point (graded)
Very large or very small numbers are best input with exponential notation. For instance,
the number 8,000,000 (eight million) is equal to 8×106. In this course, you can enter
3.14
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that as either 8 * 10 ^ 6 or as 8e6 in these problems. Try out exponential notation in the
question below.
One gigajoule is equal to 947817 British thermal units. Enter this number below in
exponential notation. The tolerance on this question is 5%.
BTU correct
9.47×105
Submit
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the Submit button.
Show Answer
Formatting Numbers
While there is a 5% tolerance for most of the problems in this course, you must also be
sure to enter your numbers in the right format. If you type "9.48e5" in the answer box
above, the computer knows how to interpret that. Similarly, it knows how to interpret
"9.48*10^5" or"9.48 * 10 ^ 5" (with spaces).
What it doesn't know how to do is handle "9.48 x 10 ^ 5" with an "x" instead of a star.
That little change throws things off. You need to use exactlythe right formatting.
This is one of the most common errors made by people who are new to edX. If you are
working on a numerical problem, you should double-check your formatting before
entering each answer.
Also - did you look at the answer to the last problem? It contains extra information about
partial credit in numerical problems! Go take a look if you didn't see it before.
Matching
1.0/1 point (graded)
This is a matching exercise. Drag the elements on the left into the ones on the right to
create a match. Click on the [-] to remove the match. You can match items with more
than one other item, but you should choose the best match if you can. Click on the
individual items for a better view if you need it.
This problem type gives partial credit! Each correct assignment is worth one point; each
error takes a point away. Play around with different matches to see how it works.
9.47e5
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Syllabus Quiz, Part 1
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Now that you know how to answer edX questions, it's time for your first quiz. Below are
some quick questions to make sure you understood the most important highlights from
our syllabus. This should be very easy - all of the information can be found on
the Syllabus, the Schedule page, and in the introductory videos in this section.
A syllabus quiz might seem a little silly, but reading the syllabus carefully will improve
your course experience. Also, our course staff often spend a substantial amount of time
answering questions where the answer is in the syllabus. We're always happy to help,
but hopefully this quiz will help you know the most important information before starting
the course.
Unlike the practice problems, this quiz is graded, so do your best! This quiz appears
as Work01 on your Progress page.
Annotate
Collaboration
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1/1 point (graded)
Select all that apply.
Which of the following are acceptable ways to collaborate?
Working jointly to develop an overall approach to an assignment
Taking someone else’s formulas and plugging in your numbers to get the final
answer
Posting answers to a problem before the deadline
Getting hints from peers or course staff if you’re stuck
correct
Submit
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the Submit button.
Show Answer
Graded Assignments
1/1 point (graded)
Select all that apply.
Which of the following types of graded assignments appear in this course?
Quizzes
Practice
Exams
Coursework
Peer-graded Essays
correct
Submit
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the Submit button.
Show Answer
Course Content
1/1 point (graded)
In this course you’ll learn... (Select all that apply.)
Details of solar and nuclear power
Details of wind power and biofuels
Environmental impacts including climate change, air pollution, and land use
The flow of energy through modern economies, including costs
Details of end uses of energy (tranportation, industry, etc.)
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Lots of theory, e.g. electrodynamics as a foundation for understanding solar panels
Lots of details about real world devices, e.g. the performance and cost of modern
commercial solar panels
How to critically compare energy options, using good references and combining
quantitative and qualitative analysis
correct
Submit
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the Submit button.
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Deep Dives
1/1 point (graded)
In this course, deep dives are...
Underwater explorations
Our recommended resources for learning more about a topic correct
Required readings
Submit
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Navigating from Page to Page
1.0/1.0 point (graded)
EdX courses have many parts to them. You can find page links at the top of the site,
sections and subsections in the course overview, and the Contact Us button on the far
left of your window.
Some subsections (like this one) also have multiple pages. Where can you find the links
that take you to these pages?
Select all that apply.
Via the buttons in the "ribbon" at the top of the page.
Via the left-right arrows in the "ribbon" at the top of the page.
Via the left-right arrows at the bottom of the page.
Via links in the course that take you to a specific page.
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Syllabus Quiz, Part 2
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Certificates
1/1 point (graded)
If you pass this course and pay for a verified certificate, where will you get your
certificate?
This course does not give certificates
In e-mail
In your edX dashboard correct
In the mail
Submit
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the Submit button.
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Grades
1/1 point (graded)
Where can you find your grades?
On the Progress page correct
By e-mailing edX
On the Discussion page
This course is ungraded
Submit
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the Submit button.
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Deadlines
1/1 point (graded)
When are the deadlines for your work in this course?
There are no assignments in this course.
Every Sunday night at 23:30 UTC.
As long as we get it done before the last day it's ok. correct
Submit
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the Submit button.
Show Answer
Where to Learn More
1/1 point (graded)
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Where can you go for more information on this course and its topics?
Select all that apply.
I can visit the discussion boards.
I can read the edX FAQ page.
I can use the Energy Resources Page.
I can search the web and beleive anything I read.
I can search the web and carefully check what I find.
I can read books on energy and the environment written in the last five years.
I can read books on energy and the environment written fifty years ago.
Background Questions
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Background Questions
These questions help you decide if you have appropriate background knowledge for this
course. They cover the kinds of introductory physics and chemistry we assume
students are comfortable with, as well as some small calculations. Please answer
quickly with your best guess, and try to finish in less than 15 minutes.
Annotate
Unit Conversion
Many of the problems on this page require you to convert from one unit to another - for
instance, from miles to kilometers, or from gigajoules to kilowatt-hours. There are many
different resources available online to help you with these conversions, and we
encourage you to become familiar with one of them and use it throughout the course.
Some options include:
Using a search engine, like Google or Bing, and typing in "20 miles in kilometers"
Using a site designed for unit conversions, like UnitJuggler.
Using a tool like Wolfram Alpha, which does unit conversions and also has curated data
on energy costs and energy content.
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Annotate
Power or Energy?
0.5/1 point (graded)
Some of these options are examples of energy, and some are examples of power. Put a
check in the box for all the examples of power.
Which of these are examples of power?
This sandwich has 600 Calories
That exercise burns 500 Calories/hour correct
Our household used only 100 kWh of electricity last month
My computer uses 60 watts of electricity correct
partially correct
Explanation
Calories and kilowatt-hours are both measurements of energy. Watts and calories per
time are both measurements of power.
Submit
You have used 5 of 5 attemptsSome problems have options such as save, reset, hints, or show answer.
These options follow the Submit button.
Show Answer
Answers are displayed within the problem
Review
Sandwich-Powered
0/1 point (graded)
How many watts do I consume if I eat a 600-Calorie sandwich in 600 seconds?
watts incorrect
4180
4180
Explanation
Each calorie is 4.18 joules of energy. 600 food calories becomes 600,000 regular
calories, which is 2,508,000 joules of energy. If we consume this over 600 seconds, the
rate of consumption is 4,180 watts.
Partial credit is awarded for an answer that missed the conversion between food
calories and regular calories.
Submit
You have used 10 of 10 attemptsSome problems have options such as save, reset, hints, or show answer.
These options follow the Submit button.
Hint Show Answer [Show Less]